No rocket science to install it: power off the keyboard, remove old EPROM, install the new EPROM, power on again and wait until the system does all the work for you. Theoretically, you will keep all your sounds, but good practice requires a backup.
eBay
For the Supernova II, I can also provide encoders, the EPROM with the last OS, switches, the DAC, jacks, the display and the LM837M. All my parts are NEW. 3 SMD Capacitor (C3, C4, C5). 3 SMD Capacitor (C6, C7, C8).
eBay
It uses almost 140 of it! And the most used ones fail after almost 20 years of use. They probably fit other Nova and Supernova models but I didn't had the chance to check it. For the Supernova II, I can also provide encoders, the EPROM with the last OS, the DAC, jacks, the display and the LM837M.
eBay
The product details (appearance, label, Plug) may vary due to the different production batches.
eBay
Supernova II RackOwner's Manual. Supernova IIAddendum Manual. Guide to Using Supernova II Multitimbrally with a Sequencer. Requests: Let us know if there is a specific manual you want. We'd be happy to find one for you.
eBay
5-Pin DIN Male to Male. Connect your favorite MIDI-compatible devices with this high-quality 5-pin DIN cable. Straight-through wiring with 5 active pins, following the 180° DIN layout used across professional gear.
eBay